SPARTA, Mich. — A Sparta man police say sexually assaulted two brothers, including one who was given a pacifier to muffle his screams, was ordered Monday to stand trial on nine felony charges that could put him in prison for life.

Tyler Ryan Lowis called himself “daddy’’ and referred to his victim as “baby boy,’’ who at times was dressed in a diaper and given a pacifier during sexual assaults that played out over a two-year period, according to court records.

Lowis, 22, lived in a mobile home community with his wife where several of the assaults occurred, court records show.

He considered himself a “mentor’’ to the victim, who is now 14, court records show. Lowis made the boy use a sippy cup, …